망고520 kernel 3.4.35 , kernel 3.0.31 기준 CPU 온도 읽기

커널 3.0.31configuration

커널 버전은 3.0.31을 기준으로 설명합니다.

소스는 http://crztech.iptime.org:8080/Release/mango520-exynos5250/android/jellybean-4.1.1/20140613/mango520-kernel3031-20140613.tar.gz

$ ./build_kernel config

명령 실행 후

System Type  ---> [*] Use thermal management

선택 후

컴파일 하여 , 커널 이미지를 다시Write하면 됩니다.

관련 드라이버 소스는

arch/arm/mach-exynos/tmu-exynos.c

에 있습니다.

관련 코드는 아래와 같습니다.

static int get_cur_temp(struct tmu_info *info) {         int curr_temp;         int temperature;         /* After reading temperature code from register, compensating          * its value and calculating celsius temperatue,          * get current temperatue.          */         curr_temp = __raw_readl(info->tmu_base + CURRENT_TEMP) & 0xff;         /* compensate and calculate current temperature */         temperature = curr_temp - info->te1 + TMU_DC_VALUE;         if (temperature < 10) {                 /* temperature code range are between min 10 and 125 */                 pr_alert("Current temperature is in inaccurate range->"                         " check if vdd_18_ts is on or room temperature.\n");         }         return temperature; }

Kernel 3.0.31 CPU 온도읽기

[root@Mango520 ~]# cat /sys/devices/platform/tmu/temperature 53

섭씨 53도 임을 알수 있습니다.

커널 3.4.35configuration

System Type  ---> SAMSUNG EXYNOS SoCs Support  ---> [*] Use thermal management

Kernel 3.4.35 CPU 온도 읽기

드라이버 소스에서

tmu_debugfs =                 debugfs_create_file("tmu_dev_status",                                 S_IRUGO, NULL, info, &tmu_dev_status_fops);

“debugfs” 파일을 생성하게 되어 있습니다.

[root@Mango520 debug]# mount -t debugfs none /sys/kernel/debug [root@Mango520 debug]# ls /sys/kernel/debug/ asoc/                              memblock/ bdi/                               mmc0/ binder/                            mmc1/ bluetooth/                         mmc2/ clock/                             pm_qos dynamic_debug/                     regmap/ extfrag/                           s3c-fb exynos5_bus                        sched_features exynos5_devfreq_int_time_in_state  shrinker exynos5_devfreq_mif_time_in_state  suspend_stats gpio                               suspend_time* hid/                               sync ieee80211/                         tmu_dev_status ion/                               tracing/ kbase_carveout                     usb/ lpa_cdev_status                    wakeup_sources mem_usage/ [root@Mango520 debug]# cat /sys/kernel/debug/tmu_dev_status Current Temperature : 47 Current TMU State : TMU_STATUS_NORMAL Memory Throttling : unthrottled Memory throttle auto refresh time : 1937 ns Normal auto refresh time : 3875 ns TMU monitoring sample rate : 200 ms [root@Mango520 debug]# cat /sys/kernel/debug/tmu_dev_status Current Temperature : 47 Current TMU State : TMU_STATUS_NORMAL Memory Throttling : unthrottled Memory throttle auto refresh time : 1937 ns Normal auto refresh time : 3875 ns TMU monitoring sample rate : 200 ms